Olympia 2130 Replacement Battery 3.7V 900mAh Li-ion

Olympia 2130 / 2203 / Becco Series — 3.7V Li-ion Replacement Battery

This is a 3.7V, 900mAh (3.33Wh) Li-ion cell for the Olympia 2130, 2203, Becco 2125, Becco 2158, and twelve additional models in the same series. The original cell degrades across charge cycles, and when it can no longer sustain voltage under screen or modem load, the phone shuts down or behaves unpredictably. This replacement restores the cell to original OEM capacity spec.

• Cross-model compatibility — 2130, 2203, Becco line: These models share a common PCB footprint, connector pitch, and BMS handshake protocol. The same 53.00 × 34.00 × 4.80mm cell fits the connector without modification, and the BMS accepts the new cell's charge table on first cycle.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on the 2130 platform and confirmed the BMS accepted the cell without triggering a lockout or cutoff error. Voltage held stable across both idle and active screen-on load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging begins on an uncalibrated reference.

Sudden shutdown at 20–30% on the Olympia 2130

This is a voltage cliff issue, not a capacity failure. When the modem or display draws a spike of current, the cell voltage drops sharply below the BMS cutoff threshold — even if the fuel gauge still reads 20–30%. The BMS cuts power to protect the cell. It happens most on aged cells or freshly installed replacements where the fuel gauge IC hasn't yet mapped the new cell's discharge curve. Run one full discharge to around 3.0V under normal load, then charge fully — this gives the coulomb counter a reference point and stops premature shutoffs.

Phone reports wrong percentage after cell swap

The fuel gauge IC holds a discharge curve calibrated to the old cell. After a cell swap, that stored curve no longer matches the new cell's actual voltage-to-capacity profile, so the percentage readout is unreliable. You'll see jumps, stalls at a fixed number, or a sudden drop from 40% to 0%. Discharge the phone fully until it shuts off, then charge uninterrupted to 100% — this forces the IC to rewrite the curve against the new cell and the percentage readout stabilises within one to two cycles.